Investigating Groundwater–Surface Water Interactions and Transformations in a Typical Dry–Hot Valley Through Environmental Isotopes Analysis

Water, Journal Year: 2025, Volume and Issue: 17(6), P. 775 - 775

Published: March 7, 2025

This study investigates the hydrological processes and water body transformation mechanisms in Yuanmou dry–hot valley, focusing on precipitation, well water, spring river reservoir during both wet dry seasons. The spatiotemporal characteristics significance of hydrogen oxygen stable isotopes across these bodies were analyzed. Key findings included following: (i) Seasonal variations shallow groundwater minimal, primarily driven by differences vapor sources transport distances seasonal effects mid-deep influenced leakage recharge from deep aquifers temperature variations, respectively. (ii) line-conditioned excess (lc-excess) deviated significantly Local Meteoric Water Line, indicating that precipitation occurred through slow infiltration piston flow with significant isotopic fractionation. (iii) River was recharged groundwater, water; lateral inflow; groundwater; transfer, strong evaporation effects. (iv) Using a binary isotope mass balance model, ratios to surface calculated be 40% 60%, Additionally, season, proportion increased. provides valuable insights into cycle valleys offers scientific basis for sustainable development management resources arid regions.

Language: Английский

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Urban Underground Space Geological Suitability—A Theoretical Framework, Index System, and Evaluation Method

Applied Sciences, Journal Year: 2025, Volume and Issue: 15(8), P. 4326 - 4326

Published: April 14, 2025

With rapid urbanization, urban underground space (UUS) development has become crucial for sustainable growth. This paper systematically reviews geological suitability evaluation (GSE) methods UUS, integrating theoretical frameworks, indicator systems, and assessment techniques. We establish a comprehensive framework based on environmental strategic (ESA) principles, analyzing key factors, including rock/soil properties, hydrogeological conditions, hazards, existing structures. The study compares weighting (AHP, EWM, CRITIC) models (FCE, TOPSIS, BNM), highlighting their advantages application scenarios. A case of Xiong’an New Area demonstrates how multi-layer UUS planning integrates constraints with goals. results show that combining 3D modeling hybrid significantly improves decision-making accuracy. review provides practical guidance optimizing utilization while addressing current challenges in selection, weight rationalization, heterogeneity management.

Language: Английский

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Analysis of Runoff Variation Characteristics and Influencing Factors in the Typical Watershed of Miyun Reservoir, China

Water, Journal Year: 2025, Volume and Issue: 17(3), P. 442 - 442

Published: Feb. 5, 2025

As an important drinking water source for Beijing, the capital of China, inflow Miyun Reservoir has been decreasing year by year, which affected urban supply security. To understand variation trend and analyze main factors influencing runoff change, this research focused on watershed as target. Based data from 1984 to 2020 at outlet basin, well precipitation, potential evaporation intensity, NDVI (normalized difference vegetation index), population, GDP (Gross Domestic Product) data, combined with correlation analysis methods, empirical statistical SCRCQ (Slope Change Ratio Cumulative Quantity) method, GIS, interannual characteristics various elements in basin were analyzed, between other was studied, degrees surface human activities, change quantitatively separated. The results showed that exhibited a distinct trend, there two mutation points 2020, 1995 2014, respectively. divided into three stages: 1984–1995 (upward T1), 1995–2014 (downward T2), 2014–2020 (stable T3). Runoff significantly correlated four indicators: summer leaf area index Chaohe River Baihe River, regional among largest. Compared period T1, contribution rates climate reduction T2 T3 6.38% 5.73%, activities 93.62% 94.27%, Therefore, annual is mainly attenuation weak. This study significant maintenance enhancement typical watershed.

Language: Английский

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Study on the Factors Affecting the Drainage Efficiency of New Integrated Irrigation and Drainage Networks and Network Optimization Based on Annual Cost System

Water, Journal Year: 2025, Volume and Issue: 17(8), P. 1201 - 1201

Published: April 16, 2025

With the frequent occurrence of extreme weather events worldwide, compound frequency drought and flood has significantly increased, imposing multidimensional pressures on agricultural water resource management. Agricultural consumption accounts for approximately 70%, with severe waste, as a large amount is lost during transmission distribution. Faced increasingly weather, traditional drainage systems may become unsustainable. Identifying factors influencing time crucial efficient drainage. The MIKE URBAN model significant potential in farmland waterlogging simulation network optimization. This study validated model’s accuracy based infiltration well overflow capacity experiments, Average Relative Error (ARE) values 2.29%, 6.52%, 4.41%, 3.17%, 4.37%, 5.69%, demonstrating good accuracy. was used to simulate networks, explore affecting time, establish an annual cost system network, optimize using genetic algorithm objective minimizing costs. Research findings: There clear negative correlation between maximum inflow wells time. As increases, becomes faster, but beyond 0.0075 m3/s (27 m3/h), efficiency gains level off. indicates that selecting at least 20% opening ratio essential. Similarly, increasing collector’s diameter enhances significantly, though effect follows diminishing return pattern. While smaller lateral spacing improves local collection, it lead flow congestion if collector undersized; conversely, larger increases paths delays, even large. An optimal range 100–150 m suggested alongside diameter. Lateral also affects performance: reduces benefit plateaus around 200 mm, making further enlargement cost-ineffective. helped design. Utilizing algorithm, optimized just 15 iterations. fitness function value rapidly decreased from 351,000 CNY 55,000 then stabilized, reducing 59,640.67 45,337.86 CNY—a 24% savings—highlighting approach’s effectiveness designing economical systems. shown simulation-based optimization networks provides more rational cost-effective approach planning infrastructure.

Language: Английский

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Hydrogeochemical signatures, quality and driving forces of phreatic groundwater in a typical headwater region of the Yellow River watershed

Applied Water Science, Journal Year: 2025, Volume and Issue: 15(5)

Published: April 29, 2025

Language: Английский

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